Changes to BookkeeperTool to support MetaCont use (first iteration)

BookkeeperTool
  - At BeginInputFile
    - MetaCont created at and put in output store
    - Input containers put in MetaCont (incomplete and tmp)
  - At EndInputFile
    - source id is recorded in vector m_completes
  - At MDS
    - all incomplete are merged and container is put in output store
    - all tmp in MetaCont with source id in m_completes merged and
      container put in output store
    - all tmp in MetaCont _without source id in m_completes merged into
      incomplete container
AthenaOutputStream
  - stop method added
  - MetaDataSvc->prepareOutput called at stop
  - MetaDataSvc->prepareOutput called at transitionMetadataFile


Former-commit-id: a59d66a7